EM3395 - Copper/brass

Emma

1. Siebe Gorman diving helmet: mostly crushed. Threaded collar and face port, port glass missing, side port mesh intact but glass missing, inlet and exhaust valves present;
2. Triangular broken section of thin-walled helmet with hole in it;
3. One-way air valve made of two threaded pieces attached with six slotted grub screws (one screw missing). One threaded piece has hexagonal bolt in section, partially abraded.